Sry thought you are speakin german too ok again in englishWhat graphic card do you have???And wich driver version do you use???I think your computer is causing this bug...Hope you can find these things out Otherwise i just need to know wich graphic card you're using

enter nvdia offical site and down new version.and this speed related to processor speed.Because you have 2.0 processor speed and 512mb graphics card and 3 gb ram your pc performance teribble because collaborate with the video card processor.No matter how high of RAM if you have a video card is incompatible with the processor card processor will take advantage of the smallest unit.So you should uprage your card version or buy new motherboard.

It's German but you can download the English Versions from the Drivers.

Install it and restart your PC. Maybe the bug is fixed. Another option is uprading your Card. Then it's not so cheap like the driver download(free xD). Cause you must buy a new Graphic Card. And a Graphic Chip is for this game not so good ;-)

@Xear these 512mb don't figure the ram (never otherwise its would be a bad graphic card from year 2003:)) its something else...I had a graphic card called GF 8800 GTS 512mb and i had a video ram of 1,7 gb...But Nvidia cards wich are GTs are still piece of shit cuz they aren't stable enough